cyan not spooling in DI 46 press

Hi there, urgent question from a printer.
I have problems with spooling on my press.
Sometimes it is going good, sometimes it stop and doesn't spool.
It's a DI 46 pro version.
Please any help is great.
it also stops during making a image, only on this unit.
Thanks, sjors

 

What error message do you get, if you get one.

 

You have to be more precisely. What does stop? The press, then what is an error, as Mark has asked. If you mean spooling stops, than you will have not message on the screen and the reason for this are a bad contacts of the particle breake. Connector 2Y2 the single one with the green wires on this unit.
Jan

 

Hi Guys

My Name is Miguel POLI .

I am printer in New Caledonia .
We just installed 2 month ago a second hand QM DI Pro .
Have a problem with Cyan unit . Sometime the machine stop during plate spooling and sometime machine stop durring imaging the plate . Have this problem only on the Cyan color .
Excuse me for my bad englih .
I am french

 

Hi Poli,
I guess it's a second press, but similar problem like Sjors had. When the press stops, you should have the error massage that will help to find the reason of problems. It could be power board, it controls both movements, but also many,many other things.
rgds
Jan

 

Hi Jan

Yes it is a second hand . This problem is difficult to resolve . I swapped logic and power boards with black unit but always the same problem . It is difficult to find the reason because sometime it is ok , somme time the plate no cgange and some time the plate change and machine stop during imaging . This afternoon I swapped the staper motor bettween black and cyan to see if I can move the problem to black unit but burned 3 plates of each without any problems ; Tomorow morning will print some jobs and will see if have problem .
rgds

 

Sjors was speaking about my machine

 

I hope you didn't moved the frame for the step motor, it needs a special tool for adjustment. Pls. don't touch every single screw on this press, many of them have factory setting. What were you expecting changing this motor? It has nothing to do with spooling, OK, it acts during imagining, but there are so many other things to check.
It's very difficult to find temporary errors. Most probably it will be one of the power supplies, you have to watch them during imagining and see if any of them (5,12,12,or 36V) is unstable in this moment when press stops.

 

when you manually try to advance the plate does it roll easily with the plate cover on?

 

Jan is correct in his advice of not removing or swapping items that have nothing to do with the plate winding process. You will introduce new problems to the machine. Here is the sequence of events for the plate winding function when burning plates as there is a different set of events when manually loading plates and they are completely independent of each other.

1. The press goes in reverse at 6600 iph.
2. The plate ratchet and pawl mechanism is activated by the air solenoid to release plate material. The particle brake is also activated at this time. (Power driver boards control this)
3. Plate take up spool now moves around splines on shaft the particle brake is holding allowing for take up of used plate material.
4. Tacho on plate cylinder monitors revolutions needed to complete plate change based on existing plate count. (Logic Board controls this)
5. Air solenoid released when plate is loaded slightly before particle brake to pull plate tight. (Power driver board controls this when told to by Logic board.)
6. Machine stops and rotates in correct direction, blanket cylinders engage to help tension plate.
7. Ready to print.

Manual winding only uses the small winding motor and will not tell you wether or not the winding mechanism is working. It is only for loading a new plate roll and has nothing to do with the automatic plate loading process.

As you can see the whole process is run from the Power Driver boards and the Logic Boards. To troubleshoot the problem move a Logic board to the 1st unit and the Power driver board to the 3rd unit. If the problem moves to either of those untis then you know what board it is. Moving both boards to another unit will not help you isolate which board it was if the problem moves.

There is one other popular thing that can stop the imaging process and I have mentioned it before on other threads. During the imaging process if the delivery chains are loose they can hit the delivery overshoot sensor and stop the imaging process. This typically happens when the plates are imaging so they never completely image, although I have seen it also stop the plate loading process in the case of delivery chains in extremely poor condition, rarely will this ever cause the same unit to stop loading plates, it would be random.

My guess is you have a bad logic or power driver board.

 

Hi Paul, you've overlooked that Poli did this test already, so I still think it's power supply

 

Jan,

I did see that post, mine was for clarification in case anyone else was interested in the entire process. Also there was no mention of the Logic Board being swapped. As for the power supply being the issue, it is possible the Lambda -12v and +12v could be the issue, but I have to ask why it would effect one unit only as they supply voltage to all of the units?

The Lambda power supply is split to provide power, the -12v goes to the Laser Drive Modules and the -12 / +12 supplies direct power to the backplane board for the Power Driver boards. The +5 and +36 power supplies are also for the backplane board, but they provide power the Logic Boards through plugs J7 (+5) and J8 (+36).

I'll be interested to see what actually fixes the problem.

 

1 He wrote it on 01-10-2012 08:47 AM
2 You are right, power supply in general, would be markable in all 4 units, but those connectors on Power Board
should be checked.
3 Me to
rgds
Jan

 

Jan,

I stand corrected, it is my selective reading that fails me again in regards to the logic board being swapped. LOL

 

Hi Jan and Paul,

We have a problem with a DI Pro. The 4 colors are not spooling, shall we procedure the same way?

 

Hi Emilio,
sorry that you have to wait so long. I've had crazzy time working all sommer, so I couldn't visit this forum. Last two weeks I've finally had my holidays.
Yes, you have probably Power Supply issue. Normaly in such a case the Power board is faulty (or some other things), but when you're haveing this problem it in all 4 units, it's most probably PS.
rgds
Jan